The term “Moving Prosthesis” is often used to mean that the patient can wear and remove the prosthesis instead of the missing teeth. These types of prostheses have to be supported by the teeth in the mouth,

as well as the soft tissues around the teeth. The prosthesis is slightly embedded in the soft tissues in the mouth, meaning it is moving, due to the load on it during chewing. That’s why we can use the term “Moving Prosthesis”.
They can be made on a metal infrastructure, or on polymethyl Methacrylate (Acrylic) in the gum color, or in the form of a metal+acrylic combination.
Instead of missing natural teeth, acrylic or porcelain ready-made teeth are used.